group size when fire forming brass
What should expectations be for groups shot while fire forming brass; 257 Roberts to AI? I used 87 gr. Speer bullets seated to touch the rifling pushed by 37.5 grains of IMR 4895 straight from the hopper, weighing powder every 5th round. This load produced a 10 shot group of just over an inch at 100 yds. The barrel was scrubbed after the first 5.
The rifle is built on a virgin Sako Forester L579 with a Montan Rifleman stainless 26" heavy barrel (1/10 twist).
I hope my expectations arn't too high, but I am really looking forward to working up loads with a heavier bullet in my newly formed brass. I'll post the results once that operation is complete.
When the shadows began to lengthen, I shouldered my rifle and plunged into the woods.
Theodore Roosevelt, Hunting the Grisly